JS9 is our Web-based implementation of DS9, the de facto standard image display for astronomy. With JS9, you can: - display URL-based FITS images and binary tables - drag and drop FITS images and binary tables - change the colormap and scale - manipulate the contrast/bias with the mouse - display pixel values and WCS position information - create and manipulate geometric regions of interest - add your own extensions using plugins and the public api - perform local (browser-based) data analysis via plugins - perform remote (server-side) data analysis via node.js or CGI - display RGB composite images - control JS9 from the command line - print images The JS9 Website contains on-line documentation, demos, and downloads: http://js9.si.edu Of course, JS9 also is available on GitHub: https://github.com/ericmandel/js9 For installation instructions, start with help/install. (If you are utilizing the JS9 Public API, please see APICHANGES for a list of rare but important changes that might require mods to your code.) JS9 can change how we think about image display and analysis, moving beyond the Desktop into the Web. You can simply drag and drop a FITS image from your computer onto the JS9 display. All of basic JS9/DS9 functionality is immediately available: zoom, pan, colormaps, scaling, regions, WCS, etc. You can extend JS9 using the Plugin facility in combination with the JS9 Public API. For example, you can perform browser-based analysis on the displayed image. On the JS9 Website, click the Plugins tab, create a region, and move it around ... In addition, URL-based data files support server-side analysis (using the original data files on the back-end server). Server-side analysis can be run, for example, in response to region changes, with the results displayed back in your browser. On the JS9 Website, click the Analysis tab, choose a task, create a region, and move it around ... JS9 originally was conceived as way to provide DS9 functionality on the Web, in order to support astronomical data archives, data centers, and individual projects. It subsequently has proven its value in the lab, on education Web pages, and as part of Web-based analysis tools. It has been tested on a variety of browsers (Firefox, Safari, Chrome, IE9) using a variety of operating systems (Linux, OS X, IOS, Windows). We are very interested in exploring new uses for JS9 as we evolve its functionality in response to community needs. If you would like to join the fun, please contact us at: saord@cfa.harvard.edu. Eric Mandel